By Matthew Gast
This can be a nice booklet for wireless process engineers to appreciate 802.11 a\b\g PHY and MAC. The ebook not just talks approximately theoretical stuff but additionally provides useful features of wireless networking.
Read or Download 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking) PDF
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Additional info for 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking)
When the laptop moves out of AP1's basic service area and into AP2's at t=2, a BSS transition occurs. The mobile station uses the reassociation service to associate with AP2, which then starts sending frames to the mobile station. BSS transitions require the cooperation of access points. In this scenario, AP2 needs to inform AP1 that the mobile station is now associated with AP2. 11 does not specify the details of the communications between access points during BSS transitions. 11 working group.
11 considered ways to work around the radiation from microwave ovens and other RF sources. In addition to the noise, multipath fading may also lead to situations in which frames cannot be transmitted because a node moves into a dead spot. 11 incorporates positive acknowledgments. All transmitted frames must be acknowledged, as shown in Figure 3-1. If any part of the transfer fails, the frame is considered lost. Figure 3-1. Positive acknowledgment of data transmissions The sequence in Figure 3-1 is an atomic operation.
Table 3-1 shows how the type and subtype identifiers are used to create the different classes of frames. Figure 3-10. Frame control field In Table 3-1, bit strings are written most-significant bit first, which is the reverse of the order used in Figure 3-10. Therefore, the frame type is the third bit in the frame control field followed by the second bit (b3 b2), and the subtype is the seventh bit, followed by the sixth, fifth, and fourth bits (b7 b6 b5 b4). Table 3-1. Type and subtype identifiers Subtype value Subtype name [a] Management frames (type=00) 0000 Association request 0001 Association response 0010 Reassociation request 0011 Reassociation response 0100 Probe request 0101 Probe response 1000 Beacon 1001 Announcement traffic indication message (ATIM) 1010 Disassociation 1011 Authentication 1100 Deauthentication [b] Control frames (type=01) 1010 Power Save (PS)-Poll 1011 RTS 1100 CTS 1101 Acknowledgment (ACK) 1110 Contention-Free (CF)-End 1111 CF-End+CF-Ack [c] Data frames (type=10) 0000 Data 0001 Data+CF-Ack 0010 Data+CF-Poll 0011 Data+CF-Ack+CF-Poll Table 3-1.